How to redirect ex command output into current buffer or file?

Question

How can I redirect or pipe the output of an ex command into my current buffer or a file?

For example, I want to read the contents of all the registers into the curre

Answer 1

:redir @a
:registers
:redir END
"ap

:redir @a redirects all messages from here on to a register named a. You follow this with your command whose output you want to capture (:registers in your case). :redir END ends the redirection. "ap means, "a uses the register named a and p puts the contents of the selected register into the current buffer.

See Capture ex command output at Vim Tips Wiki for more information :-)